Eric wrote:Hope it works well for you. Did steve have any involvement with the project?

Eric

not at this stage, no. But we have used to FWE as a bench mark, then using what Graham has learned about U Flow we can make alterations/enhancements to the design on U Flow then build and test them. This way we can ratify the system Graham has developed, if this iteration goes well we can test its thrust agains that of the std FWE i built earlier and see what if any improvement has been made. the model says it will improve but as always there's nothing quite like hard imperical data.

Ok heres the film of todays test, i cant do it for long as its Very loud.
Unfortunately not a completely sucessfull run, but its close, probably needs some length taken off the intake.
But not today. :oops:

Nick

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Dear Nick.
Great, I love the exhaust massflow. The video puts me in mind of one of Mikeâ€™s tests (with Bill I think). So perhaps after the induction length tests we should try to reduce the induction pipe diameter from 17mm to 15mm. Or, do a Mike Everman and squash it a little. Your thoughts Mike or Bill.
Graham.

I wish somebody would try my "variable displacement" thrust dingbat, which would only be modification of what you show. Here's how it would be done:

Use a hollow cylinder that just sinks in water - say one of the really big CO2 cylinders with enough added ballast to make it neutrally bouyant or just slightly sinking. You'd also need a deep bucket of water, of course. Suspend the cylinder from your cable by threading an appropriate fitting in the neck. Glue a waterproof ruler to the cylinder's side, like a section of steel measuring tape, and calibrate it on a chart using various weights pulling it up out of the water via a pulley. The greater the force, the higher it will rise above the water's surface [which will drop slightly as the displacement is reduced - that's why you want the scale ON the cylinder!].

This is only a little more work than what you have, and once calibrated would give you instantaneous readings at any power level. You should also raise your pulley if possible so that the upper part of the cable is pulled truly horizontally, for good linearity.

Very nice build of this engine, Nick! It will be fun to learn what this does to the thrust, as well as to the observable heating pattern along the pipe.